[jQuery] How to get keyCode

[jQuery] How to get keyCode

$("#tbPageInfo").keydown(
function(e){
var key = e.charCode ? e.charCode : e.keyCode ? e.keyCode : 0;
alert(key);
}
);
In FF2 it works but there is a error:
jQuery is not defined
http://localhost/qis/script/jquery.js
Line 1
jQuery is not defined
eval(function(p,a,c,k,e,d){e=function(c){return(c<a?"":e(parseInt(c/a)))+((c=c%a...
---------------------
I find the plugin:http://rikrikrik.com/jquery/shortkeys
but I am not sure how to use?
$("#tbPageInfo").shortkeys({ 'N': function () {
$('#try_me').append('N<br />'); }.... });
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